A linked list is the data structure interviewers reach for when they want to see whether you really understand pointers. Arrays hide the memory; a linked list makes it explicit, because every element holds the address of the next one. That is exactly why it shows up in coding rounds: reversing a list, finding its middle, or detecting a cycle all come down to moving a handful of pointers without losing your place. This lesson builds a singly linked list from scratch, walks through its core operations and their costs, and works our interview question Last Node of a Singly Linked List end to end before reversing a list.
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